中国産カオリナイト質粘土を選択溶解処理して調製したメソポア材料の水蒸気吸着特性 (その2) : 再溶脱処理の効果

概要

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To develop an effective alkali extraction of amorphous SiO_2 from calcined kaolinite for preparation of mesoporous material, repeated selective leaching process was examined. A Chinese kaolinitic clay sample was calcined at 1100℃ for 1hour. Each 100g of the calcined samples was suspended in 1N KOH solution (100-500ml) at 90℃ for 24hours. The selective leaching treatments were repeated. The mesoporous material obtained from first (solid liquid ratio; 1:1) and second treatment (solid liquid ratio; 1:5) showed a narrow pore size distribution at around 2.0-3.0nm in pore radius. The specific surface area and total pore volume were 83.2 m^2/g and 0.167ml/g, respectively. The water vapor adsorption isotherm showed a rapid increase at about 60%RH. It was found that the mesoporous sample was candidate as humidity self-control material. However, more examination of calcing conditions was required to separate amorphous silica phase and γ-alumina phase completely.
日本粘土学会の論文
1998-08-17